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   <div id="projectname">P2 Project - GanttMaker
   &#160;<span id="projectnumber">1.1.0.0</span>
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<div class="title">Encryption.cs</div>  </div>
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<a href="_encryption_8cs.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno">    1</span>&#160;﻿using System;</div>
<div class="line"><a name="l00002"></a><span class="lineno">    2</span>&#160;<span class="keyword">using</span> System.Collections.Generic;</div>
<div class="line"><a name="l00003"></a><span class="lineno">    3</span>&#160;<span class="keyword">using</span> System.Linq;</div>
<div class="line"><a name="l00004"></a><span class="lineno">    4</span>&#160;<span class="keyword">using</span> System.Text;</div>
<div class="line"><a name="l00005"></a><span class="lineno">    5</span>&#160;<span class="keyword">using</span> System.Threading.Tasks;</div>
<div class="line"><a name="l00006"></a><span class="lineno">    6</span>&#160;<span class="keyword">using</span> System.IO;</div>
<div class="line"><a name="l00007"></a><span class="lineno">    7</span>&#160;<span class="keyword">using</span> System.Security.Cryptography;</div>
<div class="line"><a name="l00008"></a><span class="lineno">    8</span>&#160;</div>
<div class="line"><a name="l00009"></a><span class="lineno">    9</span>&#160;<span class="keyword">namespace </span>Server</div>
<div class="line"><a name="l00010"></a><span class="lineno">   10</span>&#160;{</div>
<div class="line"><a name="l00011"></a><span class="lineno"><a class="code" href="class_server_1_1_encryption.html">   11</a></span>&#160;    <span class="keyword">public</span> <span class="keyword">static</span> <span class="keyword">class </span><a class="code" href="class_server_1_1_encryption.html">Encryption</a></div>
<div class="line"><a name="l00012"></a><span class="lineno">   12</span>&#160;    {</div>
<div class="line"><a name="l00013"></a><span class="lineno">   13</span>&#160;        <span class="comment">/* Kryptering med Rijndael-algoritme med en 256-bit kryptering</span></div>
<div class="line"><a name="l00014"></a><span class="lineno">   14</span>&#160;<span class="comment">         * Kilde: http://stackoverflow.com/questions/10168240/encrypting-decrypting-a-string-in-c-sharp */</span></div>
<div class="line"><a name="l00015"></a><span class="lineno">   15</span>&#160;        <span class="comment">/* This constant string is used as a &quot;salt&quot; value for the PasswordDeriveBytes function calls.</span></div>
<div class="line"><a name="l00016"></a><span class="lineno">   16</span>&#160;<span class="comment">         * This size of the IV (in bytes) must = (keysize / 8).  Default keysize is 256, so the IV must be</span></div>
<div class="line"><a name="l00017"></a><span class="lineno">   17</span>&#160;<span class="comment">         * 32 bytes long.  Using a 16 character string here gives us 32 bytes when converted to a byte array.</span></div>
<div class="line"><a name="l00018"></a><span class="lineno">   18</span>&#160;<span class="comment">         * */</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"><a class="code" href="class_server_1_1_encryption.html#a789559dc6ed673450cea4478ee6230b2">   19</a></span>&#160;        <span class="keyword">private</span> <span class="keyword">const</span> <span class="keywordtype">string</span> <a class="code" href="class_server_1_1_encryption.html#a789559dc6ed673450cea4478ee6230b2">InitVector</a> = <span class="stringliteral">&quot;tu89geji340t89u2&quot;</span>; <span class="comment">//Salt-værdi</span></div>
<div class="line"><a name="l00020"></a><span class="lineno">   20</span>&#160;</div>
<div class="line"><a name="l00021"></a><span class="lineno">   21</span>&#160;        <span class="comment">// This constant is used to determine the keysize of the encryption algorithm.</span></div>
<div class="line"><a name="l00022"></a><span class="lineno"><a class="code" href="class_server_1_1_encryption.html#aa18d0d3f3f3a2e641e8718ea990e361a">   22</a></span>&#160;        <span class="keyword">private</span> <span class="keyword">const</span> <span class="keywordtype">int</span> <a class="code" href="class_server_1_1_encryption.html#aa18d0d3f3f3a2e641e8718ea990e361a">Keysize</a> = 256;</div>
<div class="line"><a name="l00023"></a><span class="lineno">   23</span>&#160;</div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="code" href="class_server_1_1_encryption.html#a8c6dbc6873376ed1ba8762fe215e573d">   24</a></span>&#160;        <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">string</span> <a class="code" href="class_server_1_1_encryption.html#a8c6dbc6873376ed1ba8762fe215e573d">Encrypt</a>(<span class="keywordtype">string</span> plainText, <span class="keywordtype">string</span> passPhrase)</div>
<div class="line"><a name="l00025"></a><span class="lineno">   25</span>&#160;        {</div>
<div class="line"><a name="l00026"></a><span class="lineno">   26</span>&#160;            byte[] InitialVectorBytes = Encoding.UTF8.GetBytes(<a class="code" href="class_server_1_1_encryption.html#a789559dc6ed673450cea4478ee6230b2">InitVector</a>); <span class="comment">//Salt-værdien i et byte-array</span></div>
<div class="line"><a name="l00027"></a><span class="lineno">   27</span>&#160;            byte[] PlainTextBytes = Encoding.UTF8.GetBytes(plainText); <span class="comment">//Teksten som skal krypteres i et byte-array</span></div>
<div class="line"><a name="l00028"></a><span class="lineno">   28</span>&#160;</div>
<div class="line"><a name="l00029"></a><span class="lineno">   29</span>&#160;            PasswordDeriveBytes Password = <span class="keyword">new</span> PasswordDeriveBytes(passPhrase, null); <span class="comment">//Password-type til krypteringen</span></div>
<div class="line"><a name="l00030"></a><span class="lineno">   30</span>&#160;            byte[] PasswordBytes = Password.GetBytes(<a class="code" href="class_server_1_1_encryption.html#aa18d0d3f3f3a2e641e8718ea990e361a">Keysize</a> / 8); <span class="comment">// ?????????????</span></div>
<div class="line"><a name="l00031"></a><span class="lineno">   31</span>&#160;</div>
<div class="line"><a name="l00032"></a><span class="lineno">   32</span>&#160;            RijndaelManaged symmetricKey = <span class="keyword">new</span> RijndaelManaged(); <span class="comment">//Laves en ny instans af selve krypteringsalgoritmen</span></div>
<div class="line"><a name="l00033"></a><span class="lineno">   33</span>&#160;            symmetricKey.Mode = CipherMode.CBC; <span class="comment">//Sættes til en mode, som laver en ny krypteret værdi af den samme string, da den blander hver block sammen med det forrige den lige har krypteret</span></div>
<div class="line"><a name="l00034"></a><span class="lineno">   34</span>&#160;            ICryptoTransform Encryptor = symmetricKey.CreateEncryptor(PasswordBytes, InitialVectorBytes); <span class="comment">//Her laves selve encrypteren, ved at give den passwordet, og saltværdien.</span></div>
<div class="line"><a name="l00035"></a><span class="lineno">   35</span>&#160;            MemoryStream EncryptedStringStream = <span class="keyword">new</span> MemoryStream(); <span class="comment">//Streamen hvor det krypterede data kommer til at ligge.</span></div>
<div class="line"><a name="l00036"></a><span class="lineno">   36</span>&#160;            CryptoStream CryptoStream = <span class="keyword">new</span> CryptoStream(EncryptedStringStream, Encryptor, CryptoStreamMode.Write); <span class="comment">//En stream der kan bruges til at smide noget i - så krypterer den det, og sender det videre til EncryptedStringStream</span></div>
<div class="line"><a name="l00037"></a><span class="lineno">   37</span>&#160;</div>
<div class="line"><a name="l00038"></a><span class="lineno">   38</span>&#160;            CryptoStream.Write(PlainTextBytes, 0, PlainTextBytes.Length); <span class="comment">//.Write gør at den krypterer det, og sender det videre til EncryptedStringStream</span></div>
<div class="line"><a name="l00039"></a><span class="lineno">   39</span>&#160;            CryptoStream.FlushFinalBlock(); <span class="comment">//Flusher CryptoStream så den i princippet er klar til at kryptere ny tekst.</span></div>
<div class="line"><a name="l00040"></a><span class="lineno">   40</span>&#160;</div>
<div class="line"><a name="l00041"></a><span class="lineno">   41</span>&#160;            byte[] EncryptedStringBytes = EncryptedStringStream.ToArray(); <span class="comment">//Laver et bytearray ud af EncryptedStringStream (kan sendes over netværk osv?)</span></div>
<div class="line"><a name="l00042"></a><span class="lineno">   42</span>&#160;</div>
<div class="line"><a name="l00043"></a><span class="lineno">   43</span>&#160;            EncryptedStringStream.Close();</div>
<div class="line"><a name="l00044"></a><span class="lineno">   44</span>&#160;            CryptoStream.Close(); <span class="comment">//Lukker de to streams - burde ikke være nødvendigt?</span></div>
<div class="line"><a name="l00045"></a><span class="lineno">   45</span>&#160;            <span class="keywordflow">return</span> Convert.ToBase64String(EncryptedStringBytes, 0, EncryptedStringBytes.Length); <span class="comment">//Den krypterede string returneres</span></div>
<div class="line"><a name="l00046"></a><span class="lineno">   46</span>&#160;        }</div>
<div class="line"><a name="l00047"></a><span class="lineno">   47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno"><a class="code" href="class_server_1_1_encryption.html#a5b8038afdf4b6ccaf4676e6ce0fc9df2">   48</a></span>&#160;        <span class="keyword">public</span> <span class="keyword">static</span> <span class="keywordtype">string</span> <a class="code" href="class_server_1_1_encryption.html#a5b8038afdf4b6ccaf4676e6ce0fc9df2">Decrypt</a>(<span class="keywordtype">string</span> encryptedString, <span class="keywordtype">string</span> passPhrase)</div>
<div class="line"><a name="l00049"></a><span class="lineno">   49</span>&#160;        {</div>
<div class="line"><a name="l00050"></a><span class="lineno">   50</span>&#160;            byte[] InitVectorBytes = Encoding.ASCII.GetBytes(<a class="code" href="class_server_1_1_encryption.html#a789559dc6ed673450cea4478ee6230b2">InitVector</a>); <span class="comment">//Salt-værdien i et byte-array</span></div>
<div class="line"><a name="l00051"></a><span class="lineno">   51</span>&#160;            byte[] EncryptedStringBytes = Convert.FromBase64String(encryptedString); <span class="comment">//Input-stringen puttes i et byte-array</span></div>
<div class="line"><a name="l00052"></a><span class="lineno">   52</span>&#160;</div>
<div class="line"><a name="l00053"></a><span class="lineno">   53</span>&#160;            PasswordDeriveBytes EncryptionPassword = <span class="keyword">new</span> PasswordDeriveBytes(passPhrase, null); <span class="comment">//Input-passwordet puttes i en PasswordDeriveBytes-type</span></div>
<div class="line"><a name="l00054"></a><span class="lineno">   54</span>&#160;            byte[] PasswordBytes = EncryptionPassword.GetBytes(<a class="code" href="class_server_1_1_encryption.html#aa18d0d3f3f3a2e641e8718ea990e361a">Keysize</a> / 8); <span class="comment">//?????????????</span></div>
<div class="line"><a name="l00055"></a><span class="lineno">   55</span>&#160;</div>
<div class="line"><a name="l00056"></a><span class="lineno">   56</span>&#160;            RijndaelManaged SymmetricKey = <span class="keyword">new</span> RijndaelManaged();</div>
<div class="line"><a name="l00057"></a><span class="lineno">   57</span>&#160;            SymmetricKey.Mode = CipherMode.CBC;</div>
<div class="line"><a name="l00058"></a><span class="lineno">   58</span>&#160;            ICryptoTransform Decryptor = SymmetricKey.CreateDecryptor(PasswordBytes, InitVectorBytes);</div>
<div class="line"><a name="l00059"></a><span class="lineno">   59</span>&#160;            MemoryStream EncryptedStringStream = <span class="keyword">new</span> MemoryStream(EncryptedStringBytes);</div>
<div class="line"><a name="l00060"></a><span class="lineno">   60</span>&#160;            CryptoStream CryptoStream = <span class="keyword">new</span> CryptoStream(EncryptedStringStream, Decryptor, CryptoStreamMode.Read); <span class="comment">//Cryptostream bruges til at udføre  kryptologiske transformationer på en stream</span></div>
<div class="line"><a name="l00061"></a><span class="lineno">   61</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno">   62</span>&#160;            byte[] DecryptedPlainTextBytes = <span class="keyword">new</span> byte[EncryptedStringBytes.Length];</div>
<div class="line"><a name="l00063"></a><span class="lineno">   63</span>&#160;            <span class="keywordtype">int</span> DecryptedByteCount = CryptoStream.Read(DecryptedPlainTextBytes, 0, DecryptedPlainTextBytes.Length);</div>
<div class="line"><a name="l00064"></a><span class="lineno">   64</span>&#160;</div>
<div class="line"><a name="l00065"></a><span class="lineno">   65</span>&#160;            EncryptedStringStream.Close();</div>
<div class="line"><a name="l00066"></a><span class="lineno">   66</span>&#160;            CryptoStream.Close();</div>
<div class="line"><a name="l00067"></a><span class="lineno">   67</span>&#160;            <span class="keywordflow">return</span> Encoding.UTF8.GetString(DecryptedPlainTextBytes, 0, DecryptedByteCount);</div>
<div class="line"><a name="l00068"></a><span class="lineno">   68</span>&#160;        }</div>
<div class="line"><a name="l00069"></a><span class="lineno">   69</span>&#160;    }</div>
<div class="line"><a name="l00070"></a><span class="lineno">   70</span>&#160;}</div>
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